Wander, get the name wrong and colour up (7)
I believe the answer is:
meander
'wander' is the definition.
(thesaurus)
'the name wrong and colour up' is the wordplay.
'wrong' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'colour' becomes 'red' (red is a kind of colour**).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'red' written backwards gives 'der'.
'name' is an anagram of 'mean'.
'mean'+'der'='MEANDER'
'get' is the link.
(Other definitions for meander that I've seen before include "Wander aimlessly like a stream" , "keep dodging the point" , "Roam aimlessly around" , "Renamed in order to wander in leisurely way" , "Wandering direction" .)